Releasing device for an automatic fixed speed driving system

Abstract

A releasing device for an automatic fixed speed driving system including a first releasing signal detection means for supplying a releasing signal to a releasing signal input of the automatic fixed speed driving system when a stop lamp fuse is in a normal condition in response to the on action of a stop lamp switch and a second releasing signal detection means for supplying a releasing signal to the releasing signal input when the stop lamp fuse is in an abnormal condition in response to the on action of the stop lamp switch.

I claim: 
     
       1. A releasing device for an automatic fixed speed driving system for a motor vehicle having a stop lamp circuit including a power source, a stop lamp switch, a stop lamp fuse provided between one terminal of said stop lamp switch and said power source and a stop lamp coupled to the other terminal of said switch, said system comprising: a first releasing signal detection means for supplying a releasing signal to a releasing signal input of the automatic fixed speed driving system when the stop lamp fuse is in a normal condition in response to the on action of a stop lamp switch accompanied by the manipulation of a motor vehicle brake; and   a second releasing signal detection means for supplying a releasing signal to a releasing signal input of the automatic fixed speed detection system when the stop lamp fuse is in an abnormal condition in response to the on action of the stop lamp switch accompanied by the manipulation of the motor vehicle brake.   
     
     
       2. A releasing device according to claim 1 wherein said first releasing signal detection means comprises a series connection of a resistor and a diode coupled between the terminal of said stop lamp switch which is coupled to said stop lamp and said releasing signal input. 
     
     
       3. A releasing device according to claim 2 wherein said second releasing signal detection means comprises a series connection of a diode and an inverter coupled between the terminal of said stop lamp switch which is coupled to said power source via said fuse and said releasing signal input. 
     
     
       4. A releasing device according to claim 3 wherein said automatic fixed speed driving system comprises electromagnetic valves.